If you have not officially closed down service for this game, then it should get issues resolved within a few days or even a few weeks.
I bet if i gave this information to some of my favorite influencers and got it more public your company would get around to fixing the issue to save face, but the integrity seems to be missing. I don't expect perfect and having less people staffed to do support for this game is reasonable, but when your core game and online service is dead like this it just screams of priority problems for your company. I loved to play Ubisoft games but the next title being released will be tainted by the support i have received thus far.I'll also be petty and promote this thread and spread it to those in my many gaming communities so others reconsider buying from a company that doesn't seem to care after the purchase is done. It has been about 3 months i have been dealing with this also and honestly support has been completely ineffective in providing any real path to a solution. My progress and ingame unlocks are all not being recognized because online services are not available.
I've gone through your support troubleshooting and i have no firewall or programs blocking it from working, as well as i have reformatted my computer installing new windows 10 with all updates and only installed nvidia drivers (and other essential windows drivers) and many other things. I have the same issue (as do many in the steam discussion forums for this game) and it seems to have been after the update to Ubisoft connect.